The ErgoMotion pivot system reduces your risk of hand and wrist stress injuries by adding motion! The magic of the function is how it naturally adapts to your hand motion rather than the other way around! While all other computer mice require your hand and wrist to remain in a fixed position, the Whirl Mini pivots naturally as you move, automatically changing it's angle infinitely to match your wrist and hand. The mouse will lean, swivel or pivot with your movement so your hand and wrist are never in a fixed position, creating the most comfortable and healthy mousing experience ever.